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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47603f4553c27279aee83a54084368f7efdde85e413fc79469638f80f664e11f' 
  AND token = 'soIcFpi6NDyD9I7tFFzKjasRv9LS8txpdyLKMeO4QxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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