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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9dcc8d5dfe1ac4408ea4764c03c2dd2ee2fb04201323f1e1599e5a5bee19294' 
  AND token = 'Uv97oV0cBAWUVhSSnbVe9tk5ThuauHY9CFq8taI6LW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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