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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66a34db6be1ea5786403f1e39fc1ba95b2588532fa8f25a9b09060a88ea8c45b' 
  AND token = 'wejrUliZKz2U6tYyfQ3Nr5isauWqOIFVszHsQoN3n9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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