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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b553b85c386aa88183becaa34dc9749513e3e2e53e5899cd95d518fa334e33b4' 
  AND token = '30tf2EBZx3yT5hQEipakwFVwYjm54rPTHDo6EwAOuhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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