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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cc26445a0c1b855b950af371fea6b659635ecceebd92a5755c03b4953ad2f20' 
  AND token = '0BouxaHPy99Ls56SYqVjxgkS1MYDrIeTXQ7vJ8A+llY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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