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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8aca091106fdae6a5fe762aac56a4ff650a10e2bf6f1edb8db04f9284c39970a' 
  AND token = 'dQ5fllq1h79f115aijYUdHPZ4WYKo9xzRHaUzgGgOwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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