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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38a03337c4a3681196eef54317759691976928d977e7a8f4ade887839239ebee' 
  AND token = '1iH3uPlBc0D/9vPnjaX33Xa2Bh0Xdo7e7I/HhRAVcuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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