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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97d2cb84be04a836ad58848c8f4b5b2e4643d5c517133788b95a9e6867c043ac' 
  AND token = 'WxE+mSHbXo2l0VEzla8qe3e6u+HPYD4iWynjyoWogt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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