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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4127b4fe97112ee8aea5876dfe6b3dd83f5a52751316462347f26602eeba42e' 
  AND token = 'uvDH5rK4a7oVqHfe5LzVsNt6RXREZhiIibb/3uZqkgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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