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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f043f185afd9b229031e4b07d5339d656fc6e8b42d9a14c10f9f16d420249363' 
  AND token = 'NfjOnHmieCexAORhIKrutvQRSEw5IHvx7d1HuJ1hOl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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