SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cf2e1d4ba5c5dc21c17c7922d15f8c9849a77422d01f2ee3bd70130b0f8ed58' 
  AND token = '77XWL5+ZPvfStC1VmZip85gq0F+G1YBXwAnt5CHchhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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