SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b303bf8511802b5e220a7939f3bd49dbe32e01be3f907feda2c18e165433a6a' 
  AND token = '+LbZTX4YbZxyxhlbqPV70uzadvjBzrgoi8Ax4lNqChc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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