SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f4248ef4b19d4f9604e6d32fd5a5e650c7c996d14745690dce66d8a920cfef9' 
  AND token = 'BVJhozIzBwdFdBul5bX3KLFKiq3FH2eRBmSvI91Y9vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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