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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e61131a04d16a216253f109f4ec36aac3416b5fa0f3bf104dd41feb4a7dd948f' 
  AND token = 'HD6OQJEpXuae/ptaNqL1uh0DjyqPHRJEnxmOmIEEp9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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