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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edb362ef1c68681ec42ca2838aefcd798f0b6a35a9e1f515761247dc5ea1aaac' 
  AND token = 'IM8roTMvZfVuDOJ3NyOWYs/VxTY73IsbKDJl8duxJ5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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