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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '583ea131fe7e6c0b3e4fa7c82ea3e805199e75fb4f440a9df9e56be296c86b0b' 
  AND token = '23PoohvQMT47sQ1+yWBNauggp9/yROe1WA6YDawi1xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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