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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9818c2faf84455a430453842948e6f6c9f7e42220443de995ef663421b741914' 
  AND token = '32sby1JiB5wf/cCV0oGJxhvPJ9X2ctKzk4wloIW3zNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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