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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe4040a9cac988805f8c511b1dda6bf989f7f8343afcfc9ee9901628a7f7a42d' 
  AND token = 'zqjjlQR2Q973R78Yh1Z9d69NZaDxdSKjGK3M0d3k/qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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