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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36423396978af8f9ad02c832e9b466c729affdd3e937363d9ddedf4d49df6c38' 
  AND token = 'bOP8hJg44FBLifKL4iqjbs1mbGAPUvZA1w66Lo6wmqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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