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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60f78af8082f4a61644bce1ba1c9ea2aeb4bd222d8d3373a26970b1b003187ea' 
  AND token = 'GUqplcN4xjTjn7t1HR+DYCk6Txm0dV/DWqi3AkN/vw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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