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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36e7c598a1d1ed557dd7522035abb17d2e5c1ab4762b4c2a690041bb09c8bb5b' 
  AND token = 'JQYD0btPNx9fbENs7iXlkzPwXND0IXw+gouDqAK71g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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