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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9af65d7d774c3cd8fd1d63becb4099d81cf1c2cb5e266721ae41652db6f23da2' 
  AND token = 'wme/TPF10Hs0EpSEXl33TaMDJvRoZUTJv3OBPQV5uiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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