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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d256f7c64c2b4c471970f7925044921f256c8662c82a971cdeeeba602986e62' 
  AND token = 'LcssaPGxlXHyyg6FJ71VTrPFWiBLq3kaq2pdxZbaLg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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