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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c92cbb104fbadb6c0c42dee78e8d5e84dd710d77fd2a2b36f3f9fa56e00a58d3' 
  AND token = 'gijA2oOuyGBBMx1oDJ/QjCySIpVleeQuG+ypkfQUYks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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