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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e03329661de055bb5ccbcbbadc5be7ab01f94c927c125514db98550d9d107cc2' 
  AND token = 'aCpRgdOFT+dfM2JSsWgyk2ob9UdT6lEZQECLf70wuR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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