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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77512521bbbbe804b6bf4f4c1a730758702423622799e7046be71b140d8926e8' 
  AND token = '1qCnyZZ4wPOnMZwDPbfowb8IjVxM8wglKZ3YdPM1ypg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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