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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '991bbbaaef42689ee3250bd1b090b55d5b02dbdb5c9ab820ea8e4cc5aae20d23' 
  AND token = 'H8TZZTHWkk6Vxn0HFM9uuUfmuvbkJJf30vUpXJjE2/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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