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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cec676b4528628696dd9006ec737b9b7b5ce315a8a4de9492af6b4350bd1980' 
  AND token = '61tACq32ppM9wQgY2b90UZP7AEJe+6CAH55RWhsn/UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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