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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd08cca605ed4ff6485a2e8717a9ce8f10651d131707ab078c13a33a5d823fe1f' 
  AND token = 'Ff4yx8N/hZ9JXOXjpms0jm67mOX7jGBWdbkYMvfyMlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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