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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11a7d6f0a76ab9fdec9d3130daa0762d9d05befbb31e87d31bc32c2f65f586fe' 
  AND token = 'ad1wJ8MPnKF7xh0OoCnmYfg0jt359By3ZhsuGgwC0Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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