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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e103d043db688efe47ad2b39f597926a09f10d1af35f3f10708cff1daf8706dc' 
  AND token = 'pibpy4GgBGN24vwp5tgJgADyYkytErYh6N+fFAthc4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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