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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de9fe49ef7bb0e157c8576ca65df4cc7f6d3126a2e7fcb280268975ee434eb78' 
  AND token = '0bRpcLSQH247j2zWCoPgpWGi+IFmEdiiWNnag9wJWGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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