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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd17fae623e436dfa791f0206b1b10d2268b1872bafdb5bc1eb22893f6e486df' 
  AND token = 'zQWgGEON/RUiZiKK6ts0TprB7p89qqRmRv33ast2S0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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