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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6964ef101fac2ae0f9d39efe3674bfe5e8c29888f42d6914a0de2ad4ec30d42e' 
  AND token = 'FiMLIZurywyk3fWFWyecpLG4HGICnPmc0h6VrTGnBFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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