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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6985cc45e04249fe4ee9a5571c9dfb969fe6739e0d49bcac2a67558a9d2b6435' 
  AND token = 'loutN6J6/j74JSP3RVyAza28xKsPTCOo550yvXv7Y+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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