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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e01901e99a70da4a030e86ca1f19d503bdea83e4c61916705d8d753ac4b0593f' 
  AND token = '4K8OJwXvn8YDlwffj0dX43Uvgdks2bv+MyNeOPIuqA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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