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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f1bf4c3d8fab9d54aea9c10a1f6c3d12261d6e7e1b5ea219f57b4821afd51af' 
  AND token = 'vzvLEXP3jTNJjb9fxPqxWRyc3Dqrln1W5wAQWTbLPXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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