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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '599a324769fd296bd44f5bdab609cdde42317b66d6fb139721c26b5296578616' 
  AND token = '1MeM9jfMFOALy1BAU0LLqaAVFNu9cHsP9JKi7TaAqzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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