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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '820a1848230fd156d6dbc55a6fa4b10ba5ffed7dd4f63c5dcfb77cc569dfcb93' 
  AND token = '8qvXzda0kMeJhuSQb08SKlxtsRiNttP0LCRPw8kq2Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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