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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67a24cf5f8b3bd40d139611df6a8ffad44bad1614febf7b546be9320cccd5a7f' 
  AND token = '9DWKYM/A6419wDSSqSqCM6ij270WUJSiV7TQHuutvKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}