SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '173e158d2a73bd8f5dedf305e8f8c5df04314fb51f19473b15ba4b42376043f1' 
  AND token = 'v8qkteG38BUr9NMOOWxHWAVUPPGNvOI+Yk0CJ+Z6Oq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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