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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fe48e2fe065226216cc2f6b08b85856f30a27b9581425c6774c31cc51df72e7' 
  AND token = 'WwaP99iebnAsnlasZSW0jO6F4j0cO+GEAEyCoxZYzHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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