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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd48b43b531f6182643c16770bc114cbc4a9f96611df655dc2b92a60df2fe318a' 
  AND token = 'tbsmygvpSkRlcSj7OgPm/V4z7hO6olkC5hmgAG5eNDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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