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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9320da4cdda8ad57ad9ac1c85f3b369d4226fb0f33c4ed8ca4f9894a6bdbe227' 
  AND token = 'NbJ/LqQ0kZrLqzEovr96NAAQhR0tqTUnOIic8vMZUTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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