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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbbc1f1ca3859c882ead716c53f3a113da7daf364fa7a43d6689d6398e69d14e' 
  AND token = 'c/+cfd2kA+7UJxX9i8g6CPoQ40Sf9wB01zSDbIlncFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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