SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11ac62a918468ac3dd66f316fea8781cb1893bed18df5d6cd6540b3a5032844b' 
  AND token = 'R22FPLqtxBgTmjAcsQ+DXuNPpzhy+HpSFOYYCLkzjZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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