SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72959789e22b178e85d0ff3b3063fa34c2b66d654d33f7d1fac9a032e0bb25bd' 
  AND token = 'nu+sTH8zGReuS+OUNKHB0c5IV/xHnfe8PSOM4zqHJvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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