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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b84526cbdf5ca1b5f639213fc2f4b1a069cf76a9e6e36368a35162ba45ddc11d' 
  AND token = 'KjQU5+WJ58zGWHY3FTwjSfe3xrKxN3Lq30L3VSrORJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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