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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5115d2c533505eefd9f79a26b78a9152dca01b8014538f5e0ee1ae1d86a18cd2' 
  AND token = '7Jj/0uMpnUXFQV7b5uCc3cBtY4mPchydkkGHEtRUm5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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