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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40920ed27283770f0854c3047994a39555c8fabe764a24c87fbaedda5dba03e9' 
  AND token = 'PlenHceXRIOh15RsyTprINd+ESuTAHh7UfbH7It2d54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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