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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ffa07ee673cfe5c4ba05b3ed93ee5110f59a3a21ff80c97190391865fde8eed' 
  AND token = 'Bn9A7c7Trgadc9Pvp1RlvIQlJa4HI+ujRDQiURD8Aa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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