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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '581a8f184c02da2144010902abf3fa8f83bde00f8824030ddc702715f7c84170' 
  AND token = 'XF8vRg6QgGK/hxASUgvoU5fMf4WDYM2UGBMXtMHbUv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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