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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75553c96dbff2487b84c77c0740fa13dff5647d26b42be415ccc0f3d1bc6fd13' 
  AND token = 'xwvVWvvGk02Txe2tS1K0Ns8qen4rV6GlOrJuGpWxTFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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