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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9c7045333b49c2c9aa5153154f979e38f24e2d571730d03d80f9bb96572e477' 
  AND token = 'h6pS2tLsiHHN3TpnNgaf9fJCeSBIfW6sbf+KHZoJnHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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