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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94eaf4be327872b53b59b7ffb9376dbfe6602d7da106c341d4aba9dbaa325c0e' 
  AND token = 'Qbfy8G5pjTX+yqQPuTM3/V22US0KGw0V1WGWK08uLN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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