SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89423c68ce950cc6531f5b0833f4dadd17b99d9b1a315bac0b962fa52c028b57' 
  AND token = 'AeT5ftoqZFzrrHNRZ/LF+qPcgXQZWWzTdEW+B7o/hyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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