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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cda03e257109c267b298b50133b249d7104122d677e92a2543621c64eeb99f5' 
  AND token = 'wfuduj+Gi6pncB1PKs5j+MbieuoKnQQ+GH9MA3ijHeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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