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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8329879e6fb6f3bf1d94549ca0020aa92153bb54f318412e957420272db876f9' 
  AND token = 'eLsuGzOGIxGI8IZkWh3oM6k2aMpvNLcLR9xJZcFDfZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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